Accident survey data from 2011 to 2019 show that the proportion of safety problems in power batteries caused by thermal runaway spread accounts for more than 50%.

63.35% of domestic electric vehicle fires are related to battery thermal runaway, followed by charging (charging problems are actually related to batteries). In the subdivision of the thermal runaway scenario, it is also divided into driving, parking, and parking after charging. In fact, the most worrying thing is that when the vehicle itself does not collide or receives abnormal impact, the proportion of thermal runaway is 45.71% when driving in a mixed charging and discharging scenario, and the proportion of thermal runaway when parked after being fully charged is 41.91%.